Safety or automatic release valve



July 31,- 1928.

L. C. HUFF SAFETY OR AUTOMATI-GRLEASE VALVE- Filed Feb. 5, 1925 Nfl/30stantially the' same -planev as distinguished heat from said PatentedJuly 31, 19281 .Y UNITED* STATES 1 PATENT OFFICE.4

LYMeN C. .Horn OF CHICAGO, ILLrN COMPANY, OF CHICAGO, IL LIN Ors,AssIGNoR To ,UNIVERSAL ers, A oonronATroNoF soUT L OIL' PRODUCTS nDAKOTA.

SAFETY OR AUTOMATIC RELEASE vnLvn.

`lAppiiaumimea February advantage of being what is knownI as a reliefvalvehaving inlet and outlet in suba from an angle valve. Further, 'thespring which maintains tension on .the valve seat is housed below thepipe carrying the hot vapors `or gases, in order that the vapors andpipe which .radiate upwardly are prevented from permeating the'kspacearound and between the spring, which in the present valves, causesdistempering and` oxi-` {dation and eventual loss :of resilien (y OI' l\tension of the spring. As a further a van-,

tage, lthe chamber in which the springand communicating valve stem arepositioned, is filled' with a liquid medium, such as oil7 thus'maintaining. saidgspring and valve stemlin a bath of said oil.

Briefly, therefore, the features of the presc nt inventinr'esides in thepositioning of .the spring and valvev stein below `thevalve andcommunicating pipes into which the valve is connected, and also themaintenance -of said stem and spring in a bathof'liquid, such as Oil.Other `features of novelty and utility will ,bel brought out in thedescription of the valve in the following specification.'

rIn the drawings, lthe single :ligure'in the drawing is a verticalcross" sectionalviewv of a valve, utilizing my invention.

Referring in detail to the drawings,- 1- designates the inlet and 2 vtheOutlet of aA standard form of safety valve, having are.-A movable cap 3held inposition by the lock nuts 4.- and bolts 5, and having the usualgasket 6.- Interposed between the inlet 1- and outlet2 is A-thef hollowseat bushing 7 screw-threaded into place, provided withthe lugs 8provided with seat 'lock' screw Y9.l lSeating -on' theperiplier'yof saidhollowY bushing? is the disk 10 having the raised central portion 11, toprovide an internal recess in the disk 10, into which is fitted theupperfend. ofthestem 12. -Thisstem is supported within what may betermed a' cooling chamber 13 havin the circumferentially extending ribs14, saidlfcooling' chamberbeing provided also with'upper flange 1 5.adapted f to be conneet rbolts is, th

fcooling cham'b `lo'wer Hang 4nection.

'spring 31 provided .above the adjusted t ,against the tension .of

5, 1925. Serial N0. 6,940.

`ed with the ange 16 ofthe portion, the two. flanges being rby thesecuring nutsrl' and e usual gasket 1 9 beingy inserted n to insure' atight lit. The so er 13 is also provided with the e 2O adaplted to beconnected with the closed spring c amber 21 by n-zeans4 of thebolts22.and securing nuts23, thefusual gasket being interposed at thepoint ofY con# upper body held togethe therebetwee Stem bushings 24 andv`25 are screw threaded intoA the open ends of'the cooling chamber 13,-serving as guides .for the Stem.v The cooling chamber 13 is providedwith the tapped opening 26 forfilling purposes; it being understood thatsaid hole maybe positioned at any heighton the chamber.

The base of the stem 12 contacts anupper. cross head v27- `aperturednear its ends :to register with the yoke posts 28,fthe' upper ends ofthe latter being screwthreaded into the baseof the cooling ,chamber 13,as shown at-29, Ya tight fit being insured by the nuts 30. Below theupper' cross head 27,is a'coil at its base with vthespring washer 32 and'connecting piece 3,3 supported on the lower cross .head 34, recessedsimilarly'to upper cross head 27 to accommodate the yoke posts 28 'andSup-A ported there'onby the securingnuts 35. Adjusting screws andlock'nuts 36 are providedA below thenlowercross head 34. '.Thespring,cross'heads andyoke lposts just described, v are venclosed in theremovable housing or o coverv 37, having-lower drain plug -38 'andremovably connectedv tothe cooling chamber 13 by flanges 39contacting'the flanges' 2O of the' chamber and held, togetherby the'screwy bolts .22,and adjusting nuts 23.

The operationof the device should be apparent from theforegoing-description. The arrangement is such that the coil spring 31is first so adjusted. asto'c'ompress when tak pressure `exerted onsameis above a certain 100A point. The upper crosshead 27 is movablevertically thev yoke posts 28, while .the lower cross head 3a remainsstationary. When a pressure isbuilt up in the inlet 1 ensionfof thespring 31, 105

be forced downwardly I said spring, thus forc-` ing the disk 10 tobeunseated', andforcing'; the stein 12 `downwardly will cause the crosshead 27 and-spring 31 to be forced down#l 11o through the outlet mediummay wardly. Thus,

capes pastthe seat of disk 10 and discharges 2. When the pressuredecreases, the adjusted tension or' spring -31 returns the movable stem12 and disk 10 to normal position.

, y be introduced Ainto the cooling chamberl through-the inlet 26, andflow downwardly into bushing 25. Thus, there is maintained a liquid bodybelow the inlet 26, the working partsof the valve below said inlet beingmaintained in a bath of said cooling-liquid;

The advantages of this will be'apparent.

The vapors will not pass downwardly through this liquid body, anddangerof oxidation and eventual loss of resiliencyT of the spring isavoided, by preventing subjection of the spring to continuous lcontactwith the vapors. Y

Further, where the spring and associated working parts project below thepoint. of radiation, their eiectiveness at a maximum, eliminating theoxidation and crystallization troublesusually encountered in safetyvalves'of a'cter where the spring and associated parts are housed abovethe zone oi' heat radiation invention,

and upward vapor flow. Unloading valves constructedhin accordance withthe resent have. been found very satsactory for use with oil crackingsystems operated vunder hightemperatures and high pressures.

the excess of pressure es- Gil or other liquid coolingv l the springhousing 37, I* through the apertures 'llO'in the lower stem is alwaysthis general charlf claim as my invention: s

1. In an unloading valveA ioutlet, the combination with a vertically'Vmovable valve normally contacting with a' valve seat, a stem lowvthevvalve and cooling chamber, having introduction oi cooling stem, anadjustable tension coil sprmg pending below thestem, enclosing lsaidspring, and means-for admitting` a cooling liquid thereto, the "valveand stem being 'adapted .to compress. the spring when the pressureexerted on the valve overcomes the predetermined. the spring. 2. ln anunloading valve ea'cooling chamber having inlet and .dependingvertically be` -connected therewith, a

liquidenclosing said` adjusted tensionof having inlet and.

outletf the. combination with a .vertically 'chamber having an inlet forthe introduc-` tion of cooling liquid enclosing' said stem, anadjustable tension coil spring depending below the. stem, the valve andstem being adapted to compress pressure exerted onthe valve overcomesthe predetermined adjusted .tension of said spring, a closed housingsurrounding the spring, and means for tween the cooling chamber and'closed spring housing, whereby maintainedin abath ofcooling liquid,

l ,i LYMAN C. HUFF.l

the spring when the' communication be- I 65 the stem'and spring are

